This morning, the National Highway Traffic Safety Administration announced it launched an investigation into reports of sticky accelerator pedals experienced on certain 2007 Dodge Caliber models.

According to the NHTSA, it has received five complaints from owners, alleging the accelerator pedals won’t return to a neutral position once released. Although the investigation covers all 161,000 2007 Calibers, Chrysler says the issue affects only 10,000 cars built between March and April of 2006.

In a release, the automaker says the issue “appears to be a supplier manufacturing concern,” and notes the fault is mechanical, not electrical. Reuters reports that the pedals involved in these Calibers were sourced from CTS Corporation, the same supplier that provided accelerator pedal assemblies on the 2.3 million recalled Toyota vehicles.

Chrysler notes the Caliber has always equipped with a brake override function, which cuts engine power if both the brake and accelerator pedals are applied simultaneously. According to the automaker, this feature has been installed on all Chrysler, Dodge, and Jeep models since 2003.

At this stage, both the NHTSA and Chrysler are investigating the issue, and have not issued an official recall. The automaker pledges it will fully cooperate with NHTSA, and says dealers will inspect Calibers built within this window to ensure the accelerator pedals are functioning properly.